Stop-motion device for sewing-machines.



W. L. BARRON & F. E. USOL.

STOP MOTION DEVICE' FOR SEWING MACHINES.

' APPLICATlON FILED ma. L3. 1914.

WITNESSES: 1 6' INVENTOR fi 6. Ma, f"

' ATTORNEY ran sansmvr are.

WILLIAM L. BARRON, or NEW "roan, N. Y., AND rnrrz n. csoL; or ELIZABETH, NEW annsnv, nssienons TD run sinsnn rasnunac'runme cor/resume CORPQRATION OF NEW JERSEY. l4

STOP-MOTION DEVICE FOR SEWING-MACHINES.

Application filed February is, 914. seriaino. 813,441.

This invention relates to improvements in,

stop-motion devices for that class of sewing machines adapted to produce detached groups of stitches in which means are employed for automatically stopping the machines at the completion of each, stitching group. i

to providemeans for. controlling the startand stop-motion lever in such manner that after the machine has been started by actuation of a treadle device its automatic stopping is insured, the treadle device being rendered ineffective until the stop-motion lever moves into stopping position.

The invention comprises the usual springpressed startand stop-motion lever, which supports a plunger adapted tofengage, a cam-disk on the main-shaft'of the machine when the lever is automatically tripped bya stopping cam-wheel. The stop-leverois returned to starting position by means of a shifting lever, operated by a treadle, through the intermediary of a link-member. T he linlemcmber is formed in two sections, the lower section being provided with a socket to receive a spring-pressedplunger comprising the upper section, the two sections being normally locked together by means of a latch-clever. Then the treadle is depressed to start the machine the sectional,link-memher is carried downward thereby rockingthe shifting lever, which throws the stop-lever into starting position. At this point a spring-pressed latch acts to hold the stoplever until it is automatically released at the end of a stitching cycle. I i

In machines of highspeed,'for producing groups of tacking stitches and thelike, only a few seconds elapse betweenthe starting of the machine and the completion of one stitching cycle, and itfrequently happens Barron The invention has for its primary object that the operator, by continuing'to hold the treadle depressed, prevents the stop lever from novinginto stopping position at the normal period, which results in defective work, and, in button sewing, the breakage of needles. In the present improvements, continued pressure upon the treadle after the stop lever has been moved to starting position will separate the sections of the linkmember by the tripping'of the latch which serves to normally hold said members in fixed relation to each other, and the treadle Specification of Letters Patent. Patantfid @Ub. El), 1917. l

remains wholly ineffective until the machine is stopped by the automatically effected throw of the stop lever.

In devices of the present type, the operator may depress the treadle sufficiently to start the machine and yet insufiiciently to permit the stop-lever detent to lock into place. In such case the stop-lever will spring back into'stopping position, and the machine will be prematurely stopped. .Vh'en the lateralthrow of the stop-lever is used to impart a final thread-severing movement to a cutter operated in part by a cam, as described in Patent No. 807,676 of December 19, 1905, the premature overthrow of the stop-lever may break or disarrange the cutter mechanism. To avoid such result, the present invention includes means whereby, in the case of such partialretraction of the stop-lever, an eccentrically-mounted disk or cam-lever will project into the pat-hof the rotating cam-disk on the main-shaft and will serve to impart sufficient movement to the stop lever to permit its latch to lock into place.

In the accompanying drawings, Figure 1 is a front perspective view of the improvementsapplied to a sewing machine, and Fig. 2 is a perspective view from the rear of the improvements. Fig. 3 is a plan view, and Figs. 4, 5 and 6 are detail perspective views, showing certain parts of the improvements.

The improvements are shown applied to a. sewing machine provided with a driving shaft 1 on which is mounted the helical gearwheel2 meshing with gear-wheel 3 which serves to transmit motion to stopping cam 4 on the transverse shaft The driving shaft 1 is provided near its end with the loose pulley G and the fastpulley 7 (shown in dotted lines) the fast pulley having rigidly attached thereto a stop-motion cam-8.

Secured to the upright portion A of the bracket-arm is a supporting bracket 9 provided with a slotted outwardly-projccting boss IO'adapted to receive a cylindrical'blocl': 11 provided with a longitudinal slot within which the stop-lever 12 is pivotally supported, the arrangement being such that the stop-lever may rock laterally within boss in addition to its forward and rearward movement. The stop-lever is provided with the usual spring-pressed plunger lZ- adapted to engage canrdisk 8 on the main-shaft, and with the belt-shifting fork a. The stop lever is pressed forwardly toward stopping position by means of a plate spring 13 secured at its lower end between a bracketit and the bed-plate of the machine, the tension of spring 13 being regulated by an adjusting screw 15 on the bracket.

The stop-lever is held in its rearward or starting position by means of a detent-lever 16 fulcrumed at 1? upon the supporting bracket 9 and pressed toward latching position by means of spring 18, its hoolr 16 being adapted to engage a tooth 19 on the stop-lever. At the end of one stitching cycle a tripping point 20 carried by the stopping cam 4, comes into contact with the rear end of detentlever 16, which causes the release of the stop-lever which is thrown forwardly into stopping position, the action ofthe belt-shifting fork 8 moving the driving belt from the fixed pulley 7 to the loose pulley 6, and the lateral overthrow of the stop-lever serving to impart movement to cutter-actuating bell-crank 21 in a manner well known;

The supporting bracket 9 is provided at its upper end with the spaced projecting arms 22 between which is fulcrumed by means of stud-bolt 23 a shifting lever 24: provided with an arm 25 which engagesthe stop-lever 12 and is adapted to move the same to starting position when the shifting lever is operated. A nose 26 on'the shifting lever is engaged by the head of a screw 27 on the stop-lever when the latter springs forwardly to stop the machine, whereby part of the shock of such movementis taken up by the shifting lever and the latter is held against upward movement.

The shifting lever 2 f is operated by a treadle device through the intermediary of a link-member formed in two sections, 28 and 29. The upper link-section 28 is a plunger pin fitted within the tubular portion 29 of member 29, and provided at its end with a hook to engage the outer end of the shifting lever. A coiled spring 30 surrounding the plunger, pin 28 and interposed between a collar 31 thereon and the socket portion 29 of link-section 29 tends to press the two link-sections apart, an action which is normally resisted by a latchdever 32 fitted within a slot 33 formed in linksection 29 and fulcrumed at 34-. Latch-lever is provided with an angular end 32- which is adapted to engage the annular shoulder or'fla'nge 81 ofcollar 31 under the action of a spring 35, one end of which is secured tothe rearwardly projecting arm 36 of the latch-lever and the opposite end of which is clamped under the head of a screw 37 secured to link-section 29.

The'link-meinber is connected to a treadle rod 38, the hook end. of said rod being received in slot 39 formed in the lower end of link-section 29 and held in place therein by means of a pin a0 provided with annular grooves e1, 41* to receive the free end of a detent-spring l2, fitted within a slot in the said lint:- end clamped under the head of a screw all. With one exception th walls of grooves all,

ll are slightly beveled so that the detentspring will not offer sui'licient resistance to prevent the withdrawal of pin at) from slot 39 when it is desired to remove the treadle rod. However, complete,withdrawal of pin i0 is prevented by the action of the detent-spring on the angular outer wall of groove 41. p 77 It will be seen that downward movement of the treadle rod and the sectional linkmember 28, 29 will operate shifting lever 24: to shift the stop-lever from stopping position (Fig. l) to starting position (Fig. 2). By continuing to depress the treadl'e the operator will carry the rearwardly extending arm 36' of latch-lever 32 into contact with a tripping finger 45 adjustably secured to stop-lever 12, whereby the angular end 32 of thelatch-lever will beretracted from shoulder 31 of collar 81 and link-section 28 will be given a slight upward movement -action and having one 7 cit by the action of spring 80. it will beseen that the action of latch-lever S2 in uncoupling the link-sections 28, 29, willfree the shifting lever 2e and will render the treadle ineffective. At this point further'downward movement of link-section 29 is prevented by the contact of its stud d6 with the base of a guide-slot l7 formed in the braeketkinember d8 having its foot l9 secured by means of screws 50 to the lower end of the stoplever, the member 48 beingembraced by the spaced ears a of the said linlcsection 29. 7

When the stop-lever springs into stopping position at the end of a stitching cycle, the head of screw 27 will engage nose 26 of the shifting lever, and the latter, together with link-section 28 will be held firmly against upward movement. Now when the treadle is released a coiled spring51 secured at one end to the stop-lever l2 and at its opposite end to link-section 29 will move the latter upwardly until latch-lever 82 engages shoulder 8l on collar 31 and the two link-see tions are locked together.

Asheretofore stated, the operatormay depress the treadle sufiiciently to start ma- "pivotally supports an eccentrically mounted disk or cam-lever 55 disposed adjacent plunger 12 and projecting slightly beyond the face of the latter. l/Vhen the stop-lever is retracted sufliciently to carry the plunger out of the pathof the rotating cam-disk 8 but insufliciently' to permit detent-lever 16 to lock in place, the rotating cam-disk S will swing the cam-lever on its pivotal support whereby the stop-lever will be given a slight rearward movement until it is seized by the detent-lever. A coiled spring 56 surrounding stud-screw 5% and having one end secured to bracket 52 and its opposite end secured to cam-lever 55 serves to maintain the latter normally in retracted position. And the bracket 52is provided with an adjusting screw 57 against which the cam-lever rests and by means of which its retracted position may be'adj'usted.

It will be understood that the construction of sectional link-member 28, 29 and of other parts of the improvements may be greatly modified within the scope of the invention, it being manifest that the same is not limited to the precise embodiment thereof herein shown and described.

Having thus set forth the nature of the invention, what we claim herein is 1. In stop-motion mechanism for sewing machines, the combination with a springpressed startand stop-motion element, of a latch for locking said element in starting position in opposition to its spring, automatic tripping means for said latch, a shifting device for said startand stop-motion element, and means adapted to render said shifting device inoperative to prevent the automatic stopping of the machine after the startand stop-motion element is locked in starting position.

2. Stop-motion mechanism for sewing machines comprising, in combination, a spring-pressed startand stopmotion lever, a latch for locking said lever in starting position in opposition to its spring, automatic tripping means for said latch, a shifting device and operating means therefor including two relatively movable link-sections connected to said shifting device, a spring reacting against both'link-sections, a locking member adapted to normally lock the linksections in fixed relation to each other, and means for unlocking the link-sections as said lever is moved to starting position, whereby said last mentioned spring may take up part of the shock of the stop-lever,

in springing to stopping position.

' In a sewing machine, in combination, a

spring-pressed startand stop-motion lever, automatic tripping means therefor, a shifting element for moving said lever to starting position, a manually, operated element, relatively movable link-sections connecting said elements, a locking device adapted to normally lock said link-sections together,

'means whereby movements of said inanually operated element unlocks said linksections after said lever has been shifted to starting position, and means whereby said manually operated element may be shifted at will without looking said link-sections togetherwhile the machine is in operation.

a. In a sewing machine, in combination, a spring-pressed start and stop-motion lever, a latch for holding said lever in running position, a shiftingvelement having a lost-motion connection with said lever while said lever is in running position, means wherebysaid lost-n1otion is taken up upon movement of'said lever to stopping position, manually operated means for actuating said shifting element including relatively 'movable sections, a spring-latch for locking said sections together, and a stop for tripping said latch.

5. In stop-motion mechanism for sewing machines, the combination with a springpressed startand stop-motion lever, of a latch for locking said lever in starting position in opposition to its spring, automatic tripping meansfor said latch, a shifting lever for the stop-lever, a plunger-rod connected to the shifting lever, a socketmember adapted to receive said plunger-rod, an operating rod connected to said socket-mein her, a latch-lever adapted to lock together the plunger-rod and the socket member, and atripping finger adapted to engage said latch-lever at a predetermined period during the movement of said operating rod.

6. In stop-motion mechanism for sewing machines, the combination with a springpressed startand stop-motion lever, of a shifting lever and an operating rod therefor, relatively movable link-sections connecting the shifting lever and its operating rod and including a socket-section and a plunger-rod fitted therein, a latch-lever adapted to normally lock the link-sections in fixed relation to each other, a tripping finger adapted to engage said latch-lever at a predetermined period, a stop device for said socket-section, and a spring adapted to return said socket-section to its normal p0sition when said operating rod is released.

7. In stop-motion mechanism for sewing machines, the combination with a springpressed startand stop-motion lever adapted to engage a rotating cam-disk of a shifting device for said stop-lever, a latch for locking said stop-lever in starting position in opposition to its spring, and means adapted to be operated by said cam-disk to impart a movement to the stop-lever, when the latter is shifted to starting position but insufficiently to permit its latch to look into place. a

8. In stop-motion mechanism for sewing machines, the combination with a springpressed start and stop-motion lever adapted to engage a rotating cam-disk, of a shifting device for said stop-lever, a latch for locking said stop-lever in starting position in opposition to its spring, and a cam-lever carried by the stop lever in position to be engaged by said rotating cam-disk when the stop-lever is shifted to starting position but insufliciently to permit its latch to look into place.

A stop-motion mechanism for sewing machines, the combination with a springpressed startand stop-motion lever adapted to engage a rotating cam-disk and a latch for locking said stop-lever in starting position in opposition to its spring, of manually operated means for imparting an initial movement of the stop-lever toward starting mamas position, and automatically acting means adapted to impart a final shifting movement to the stop-lever to complete its movement into starting position.

10. In stop-motion mechanism for sewing machines, the combination with a rotating cam. a spring-pressed star and stop-motion lever adapted for engagement with the same, and a latch for locking said stop-lever retracted from operative relation with the cam, of a shifting lever, a link-member connected with the same at one end and having at the other end a recess, a treadle-rod having an e 'ed end entering said recess of the linkmember, a retractable pivotal pin erasing said recess of V18 link-member and a the eye of the treadle-rod and being provided with spaced shoulders, and a spring detent adapted for engagement with either of said shoulders of the pivotal pin for retaining it in operative or retracted position.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribing witnesses.

ll ILLlAll'l L. BARRGN. FRITZ E. OSOL. ll'itnesses I H. A. Komzmnmn, J12, E. J. ARNOLD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner if Patents, Washington, D. C. 

